Fusion mechanism of 12C + 232Th system at sub-barrier energy realm

The fusion-fission dynamics of 12C + 232Th reaction at energies in sub-barrier realm are analyzed by using one-dimensional Wong formula and symmetric-asymmetric Gaussian barrier distribution (SAGBD) model. For this, we examined the fusion cross-sections data and related barrier distribution. Calculations based on simple Wong formula fails to explain the fusion data specially at below barrier energies, while SAGBD model predictions qualitatively as well as quantitively reproduced the fusion dynamics of studied reaction. The effects of coupling in SAGBD model are calculated in terms of channel coupling parameter λ, which point towards the reduction of height of the effective fusion barrier and consequently recovered large enhancement in fusion cross-sections in comparison with estimations obtained by using the Wong formula. Furthermore, the percentage reduction of the nominal fusion barrier due to involvement of nuclear structure effects, is described in terms of VCBRED. For the studied system, χ2-analysis shows small value for the SAGBD based results and hence clearly indicates the consistency of the present approach.